Everything You Need to Know about Narcissists, Psychopaths, and Abuse - click on this link: http://www.narcissistic-abuse.com/faq1.html
Covert narcissists are aware of their innate limitations and shortcomings and, therefore, constantly fret and stress over their inability to fulfil their unrealistic dreams and expectations. They avoid recognition, competition, and the limelight for fear of being exposed as frauds or failures. They are ostentatiously modest.
Covert narcissists often feel guilty over and ashamed of their socially-impermissible aggressive urges and desires. Consequently, they are shy and unassertive and intensely self-critical (perfectionist). This inner conflict between an overwhelming sense of worthlessness and a grandiose False Self results in mood and anxiety disorders. They team up with classic narcissists (see below), but, in secret, resent and envy them.
Contrary to misinformation spread by "experts" online, covert narcissists are not cunning and manipulative. Classic narcissists are: they often disguise their true nature effectively, knowingly, and intentionally. They are persistent actors with great thespian skills. Not so the covert narcissist: he suppresses his true nature because he lacks the confidence to assert it. His is not a premeditated choice: can't help but shy away. The covert narcissist is his own worst critic.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 3 DVDs with 16 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)